For purely Mass Effect tumblrs, my faves are: http://garrusvakarian2153.tumblr.com/ http://femshepping.tumblr.com/
For general tumblr users that post and/or reblog Mass Effect stuff as well as whatever general stuff they like: http://justicarrsamara.tumblr.com/ http://walkingbomb.tumblr.com/ http://femshepisabadbitch.tumblr.com/ http://treesandturians.tumblr.com/ http://commander-lola.tumblr.com/ http://antivanrogue.tumblr.com/ http://parksandeffect.tumblr.com/ http://dreadwolfed.tumblr.com/ http://dreaddkitty.tumblr.com/ http://trustabrandybuckandatook.tumblr.com/ http://singforstarlight.tumblr.com/ http://itspuddingcakes.tumblr.com/ http://acequeenking.tumblr.com/ http://bravenewgirl12.tumblr.com/ http://shenzi123.tumblr.com/ http://space-rose.tumblr.com/ http://spacecharlie.tumblr.com/ http://theillusivewoman.tumblr.com/ http://lady-z13.tumblr.com/ http://tarysande.tumblr.com/ (She is a popular fanfic writer who gets asked lots of questions about her headcanons for her shep (Grace) and Garrus, if you like that sort of thing)
Okay I think I've listed probably way too many, haha sorry! There are obviously a lot more fans on tumblr, and there are more ME specific blogs. The fandom on there is USUALLY pretty chill (unlike say, the Dragon Age fandom :/). There are maybe a couple of people who don't like to play nice as with every fandom, but they are pretty rare and for the most part the fandom are all a nice bunch. Obviously as it's tumblr there's more graphics and fanart rather than long discussions, but the tags are often a great place to see the extent of people's love of Mass Effect (and there's usually a good chunk of Garrus flailing too!)
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For purely Mass Effect tumblrs, my faves are:
http://garrusvakarian2153.tumblr.com/
http://femshepping.tumblr.com/
For general tumblr users that post and/or reblog Mass Effect stuff as well as whatever general stuff they like:
http://justicarrsamara.tumblr.com/
http://walkingbomb.tumblr.com/
http://femshepisabadbitch.tumblr.com/
http://treesandturians.tumblr.com/
http://commander-lola.tumblr.com/
http://antivanrogue.tumblr.com/
http://parksandeffect.tumblr.com/
http://dreadwolfed.tumblr.com/
http://dreaddkitty.tumblr.com/
http://trustabrandybuckandatook.tumblr.com/
http://singforstarlight.tumblr.com/
http://itspuddingcakes.tumblr.com/
http://acequeenking.tumblr.com/
http://bravenewgirl12.tumblr.com/
http://shenzi123.tumblr.com/
http://space-rose.tumblr.com/
http://spacecharlie.tumblr.com/
http://theillusivewoman.tumblr.com/
http://lady-z13.tumblr.com/
http://tarysande.tumblr.com/ (She is a popular fanfic writer who gets asked lots of questions about her headcanons for her shep (Grace) and Garrus, if you like that sort of thing)
Okay I think I've listed probably way too many, haha sorry! There are obviously a lot more fans on tumblr, and there are more ME specific blogs. The fandom on there is USUALLY pretty chill (unlike say, the Dragon Age fandom :/). There are maybe a couple of people who don't like to play nice as with every fandom, but they are pretty rare and for the most part the fandom are all a nice bunch. Obviously as it's tumblr there's more graphics and fanart rather than long discussions, but the tags are often a great place to see the extent of people's love of Mass Effect (and there's usually a good chunk of Garrus flailing too!)