Is it social suicide to delete all my social networking accounts?

[Sam]

It depends on how often you are on those networks - since you have so many little are likely to have major impact. If you are not sure then only deactivate your account, rather then delete ( at least on facebook ), or delete the smaller, least used account and only leave the main one (probably facebook?), and just use it less from then. Visit http://www.Deleteaccount.co.uk - sounds just your ticket for deleting everything.

Specifically:
http://deleteaccount.co.uk/Delete_accoun...count.html
http://deleteaccount.co.uk/Delete_accoun...count.html
http://www.deleteaccount.co.uk/Delete_ac...count.html

I don't know about tumblr.