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If you're on Twitter and looking to donate to a good cause, Reid Brignac is currently holding an online auction to support Operation Once in a Lifetime, a charity whose mission is, "...to make the dreams of soldiers and their families come true by providing free financial and morale support."
Brignac is raffling off four "Twitchange" packages: a follow, re-tweet, mention, or all three. In short, if you win the the Follow raffle, Brignac will follow you on Twitter for 90 days; if you win the re-tweet auction, he'll re-tweet one of your tweets; and so on and so forth. Also, with each package, Brignac is throwing in an autographed baseball.
You can find more details on Brignac's raffle page. All the auctions end tomorrow, so act fast if you would like to bid.