Twitter passed the one billion tweet mark back in November of last year. It took them less than a year to quintuple that figure: according to Gigatweet, Twitter has now passed the 5 billion tweet mark. Wow.

CNet reports that the 5 billionth tweet was delivered by one of Twitter’s (Twitter) initial loyal users, which seems fitting. Robin Sloan’s famed 5 billionth tweet read simply, “Oh lord.” It was apparently an unintentional, yet appropriate, religious moment.

Placing this milestone on the Twitter timeline makes the 5 billionth tweet appear all the more impressive, considering the service was only up to 1.6 billion at the end of April this year. That means about 3.4 billion tweets have been sent in about the past 6 months. Again, there’s a word for that: wow.

Have you managed to tweet any Twitter milestones? What’s your bet on how long it will take Twitter to pass the 10 billion tweet mark?