I am still undecided about this....yes the are holes..but he plays the plausible deniability thing well....
Take Area 51 for example....Government denies it exists...but there is a place in Nevada where no air traffic is allowed and where you vannot enter due to armed guards....
John Titor plays this card well...he even say that he does not expect us to believe....
but :
1) His theories appear sound in both content and accuracy..but he is lacking fundamental proof that there are correct..so..for now, they appear as just 'theories' (albeit very interesting ones...along the lines of my own)
2) He stated somewhere that it this is a different 'worldline' to his own, but he would not disclose the true secrets of his time machine for fear of us having one....
3) No one ever logged or attempted to log his IP. With this they could have found out ALOT about him...
4) It is still too easy to create a hoax now-a-days.
I prefer to remain skeptical on this...if there is a civil war in the US that starts in 2005 then I may move to the hills and invest in Hydrogen fuel cells