So who in tech is in for the next 100 years? Obvious answers from our sources include Apple ( AAPL) -- whose ability to innovate in consumer electronics is viewed as virtually untouchable -- and Google ( GOOG), thanks to its significant investment in efficient data centers and sustainability (not, as you might think, its core search business). But what about the next generation of young tech companies -- those that have recently gone public or are speculated to do so in the near-term? It wasn't so easy. Most of the hot Internet companies popular with investors earned a thumbs down from our sources. No one we spoke to expected notable social networkers LinkedIn ( LNKD), Twitter or Pandora ( P) to last more than 10 years, although Groupon received slightly higher praise. "It's an interesting gimmick," said Pund-IT principal analyst Charles King. "I'd give them two decades tops." Read on for the three young tech firms likely to be around 100 years from now.