I've been focusing more on my Pinterest boards this week. I haven't tried Instagram at all, but feel like I have my hands full with the blog, Facebook and Pinterest. Tumbler sounds like it may be worth a look though, eh?
SEO - I've actually picked up quite a few pointers right here in this group. Also, this looks like a nice nugget of pertinent SEO info:
https://www.etsy.com/blog/en/2013/4-ways-to-improve-your-seo/I think I'll go over it once again myself!