If your target market is the 25 and under crowd primarily, yes.
The vast majority of stats I have seen, and people I have talked to, over 25 do not spend endless hours on social networks, tweeting, and the rest. They are too busy with work and families.
It is not to say EVERYONE over 25 does not use these things. However, the vast majority I have seen in statistics do not use them daily, if at all. I do not know about you, but I wanna target the audience who can PAY for my sites and services.
