i think tumblr is a great site! my daughter calls it her "Diary". She tells me you wont see any sexual behavior unless you follow a blog that posts that stuff. Same for drugs. I only worry that she will come across it but i know she is mature enough to unfollow whoever posted it so she wont come accross it anymore. I've seen her blog and its mostly photography and comics and humor. I think that this is a great site to allow your child to have if you can trust them! I also have parental controlls on my computer which will blur out the innapropriate content which im glad about! I think a good age would be 13 and up. Or 12 and up if you have a more mature child.

There is a lot of beautiful, artistic content on Tumblr. There's also a lot of images and posts that encourage and support self-harm (cutting), eating disorders like anorexia, serious drug use, and sex. Teenagers are easily exposed to graphic (sometimes violent) sexual imagery. It is very easy to find blogs where you can get sucked into a depressed, very disturbed mind. If you have kids who are prone to this sort of thing, be very careful. Lots and lots of pro-Anorexia, thinspo imagery, too.

to me tumblr is a site for older teens and up to express what they like,tumblr does not get kid's into stuff like sex,drugs,violence.it's a blog people.parents, if you don't want your child on this site just use parental controls.