The Internet is known as a widespread source of information, but there is a considerable question: Is the Internet a reliable source or not? Mainly it is.
Need more improvement in presenting this idea. This is your hook with what you open your essay and if this is going to be boring and not clear them you'll be trouble :(
My suggestion;
The Internet gains its audience at a terrific speed on daily basis. However, is it a reliable source of information is a serious concern today.Secondly, since the Internet is one of the favorite media to communicate and everyday lots of information are bandied, so people try to share the authentic and up-to-date information to show that they have something in common with others.
This is another confusing sentence. Better you rephrase this line. Pay attention to what Misterwandering's comments too :)