Should I continue developing my site further or keep a simple landing page with email capture to test my idea?

Yep. Although I don't think that's limited to MVPs. It's just always the case. You can copy code, features, etc. but you can't copy soul. There will always be people who copy you. It's better to keep moving forward and accept the copy cats than it would be to try and shield yourself. Keep an eye on the copy cats. But in the long run, if you're authentic and worthy, you will beat them.

Whoa, start by reading the Lean book again; you're questions suggest you are making a classical mistake made by too many entrepreneurs who live and breath Lean Startup. An MVP is not the least you can show someone to evaluate whether or not building it is a good idea; an MVP is, by it's very definition, the Minimum Viable Product - not less than that. What is the minimum viable version of a professional collaboration network in which users create a professional profile visible to others? A website on which users can register, have a profile, and in some way collaborate with others: via QA, chat, content, etc. No? A minimum viable product is used not to validate if something is a good idea but that you can make it work; that you can acquire users through the means you think viable, you can monetize the business, and that you can learn from the users' experience and optimize that experience by improving the MVP. Now, that doesn't mean you just go build your MVP. I get the point of your question, but we should distinguish where you're at in the business and if you're ready for an MVP or you need to have more conversations with potential users. Worth noting, MOST entrepreneurs are ready to go right to an MVP. It's a bit of a misleading convention to think that entrepreneurs don't have a clue about the industry in which they work and what customers want; that is to say, you shouldn't be an entrepreneur trying to create this professional collaboration network if you don't know the market, have done some homework, talked to peers and friends, have some experience, etc. and already know that people DO want such a thing. Presuming you've done that, what would you present to potential users BEFORE actually building the MVP? For what do you need nothing more than some slides? It's not a trick question, you should show potential users slides and validate that what you intend to build is the best it can be. I call it "coffee shop testing" - build a slide of the homepage and the main screen used by registered users; sit in a coffee shop, and buy coffee for anyone who will give you 15 minutes. Show them the two slides and listen; don't explain, ONLY ask.... - For what is this a website? - Would you sign up for it? Why? - Would you tell your friends? Why? - What would you pay for it? Don't explain ANYTHING. If you have to explain something, verbally, you aren't ready to build your MVP - potential customers don't get it. Keep working with that slide alone until you get enough people who say they will sign up and know, roughly, what people will pay. THEN build your MVP and introduce it first to friends, family, peers, etc. to get your earliest adopters. At some point you're going to explore investors. There is no "ready" as the reaction from investors will entirely depend on who you're talking to, why, how much you need, etc. If you want to talk to investors with only the slides as you need capital to build the MVP, your investors are going to be banks, grants, crowdfunding, incubators, and MAYBE angels (banks are investors?! of course they are, don't think that startups only get money from people with cash to give you for equity). Know that it's VERY hard to raise money at this stage; why would I invest in your idea when all you've done is validate that people probably want it - you haven't built anything. A bank will give you a loan to do that, not many investors will take the risk. Still, know not that your MVP is "ready" but that at THAT stage, you have certain sources of capital with which you could have a conversation. When you build the MVP, those choices change. Now that you have something, don't talk to a bank, but a grant might still be viable. Certainly: angels, crowdfunding, accelerators, and maybe even VCs become interested. The extent to which they are depends on the traction you have relative to THEIR expectations - VCs are likely to want some significant adoption or revenue whereas Angels should be excited for your early adoption and validation and interested in helping you scale.

There isn't a lot of published information that I've seen (or can quickly find) on how washio and postmates validated their business model, but I definitely agree that starting fairly lean and validating your business first even if that means a lot of manual effort up front is a better approach than investing heavily in infrastructure before launch. Of course, if you are very successful, that manual work will pile up quickly and managing it could be quite painful, but you can have worse problems than a successful launch. Maff Rigby's 7-day startup recommendation is definitely a good one.

The idea of an MVP is 'minimum, viable' ... If you feel you need a "good amount" of funding, I would challenge if you are minimum enough. Obviously, without knowing the details of your product, your ideal customer, or what need you will solve, it is hard to help expose what is necessary in an MVP and what is a Phase II or Phase III feature. I am happy to help you work through this, or answer specific questions, to get you rolling. Just book a call with some times that will work for you. Regardless, I would love to know more about it and how it goes after launch. To your success, -Shaun

The best way to build an MVP for any SaaS product is to create a landing page that looks like a real product. Here's an example of one I built. http://www.happiily.com In this case, it advertises the primary features of the product and invites people to sign-up. When they do, they are asked for information which qualifies the person and then sends me an email. I built this quickly and very inexpensively and started getting inbound leads from it shortly thereafter. I got on the phone with each person who signed-up and explained the features I wanted to build and was able to do a lot of customer learning based on that. Happy to talk to you in a call if you'd like to talk more about customer development with SaaS products.