Some need to know companies which you will notice more in time are the following:
Lending Club Corp ( a peer to peer lending group)
Atlassian ( software tool startup)
Marketo Inc ( marketing software comp)
Criteo and Yume ( advertising tech firm)
GoPro Inc ( sports camera maker)
Talks of twitter interest in going public are starting to grow. If it ever goes public I think I will get a share but no more than one and I would be watching it very very closely. It may break my investment philosophy but twitter is one of those things that we have made into an everyday thing. So Long as there is demand there is money to make.