There is an actual Twitter account called [https://twitter.com/#!/superbeckyrosen @SuperBeckyRosen] which has tweets by the character as posted in the episode. It contains some tweets not seen see on the show, and doesn't have Becky's last tweet. The tweets were all posted on 24 September, which would coincide with when the episode was being written. In the episode, when we get a look at Becky's Twitter, and it's not a screenshot of the actual one but a mockup, which includes the last of Becky's tweets we see on the episode. Also the entries are dated 12th October, which would be when post-production on the episode was being done. Notably the dates are not written in US format but the normal dd/mm/yy format.
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==[[7.22 There Will Be Blood]]==
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'''Alpha Vampire:''' Right, right, your flesh is crawling. All you want to do is kill me now. You hate having to wait and come back, and try again...<br>
'''Dean:''' Pretty much. I wouldn't leave that head to close to that body for too long.<br>