What social media marketing strategy templates would you recommend?

If you're asking for templates, with no offense, maybe you shouldn't be creating a strategy...?

If you google a request you will find numerous example sand approaches which will be helpful. My advice is, rather than a specific template, to start with the business rather than the template.
Determine the goal of the business as a whole, where it's market is on social media, and the resources available to manage social media channels. Have this in writing and it will be your frame work for implementing the template itself (which is, in effect, a series of tasks rather than a strategy).

Any successful Marketing Strategy (built to guide SMM, PR, Inbound, Outbound, or other categories of Marketing Initiatives & campaigns) should be customized for the needs, goals, and target markets of the client. That said, what I commonly find is that younger and/or smaller companies tend to jump right to tactics without first setting the promotional stage with Brand Identity (http://strategygbd.co/brand-identity/) as a foundation, and a strategic roadmap built upon the Brand ID to guide the way. Failing to set the stage effectively leads to low traction and conversion (OPPOSITE of their goal) and high churn rates.

Here is a video that addresses these considerations in even greater detail than the article (link above) provided: https://www.youtube.com/watch?v=YO5j8T9e3mI. Also, this easy reading eBook covers a range of topics related to creating and implementing effective Marketing Initiatives: http://strategygbd.co/downloads/business-building-tips/.

Naturally, all of these tools and recommendations are offered to facilitate your success! If you find that additional insights, and an even more customized approach regarding your client challenges, would be useful right away, request a call with me. That's what I'm here for...