A classic case of 1 + 1 = 0?

Been thinking recently, what internet brands have come back from the dead? (Not Apple, they are a hardware company.)

The Napster brand was acquired, but the new company never really made it.

I was chatting to a young dev on the Zaarly startup crawl who said he worked in 'gaming', but when pressed he said he worked for a startup acquired by Yahoo. He didn't like saying he worked at Yahoo. That is a very strong signal they are dying.

MySpace, Bebo, Friendster. It seems like once you hit the deadpool or are on your way down, there is no way back?