NEW YORK (CNNMoney.com) — In the aftermath of a severe earthquake in Haiti late Tuesday, Twitter is playing a critical role in collecting donations to help disaster victims.

Fundraising efforts by the American Red Cross and rapper Wyclef Jean were two of the top 10 trending topics on Twitter early Wednesday. Both organizations asked Twitter users to text a number to make a donation that would be added to their cell phone bills.

The International Federation of the Red Cross estimated that 3 million people were affected by the 7.0-magnitude quake, the center of which was located near capital city Port-au-Prince.

Twitter lit up with posts from around the globe, including some tweets from Haitians who had no other way to communicate amid the chaos. Donation efforts on the site mobilized quickly amid the first natural disaster to strike since the social media site took off.

At about 6:30 p.m. ET Tuesday, the American Cross tweeted that it was pledging an initial $200,000 to assist those affected.

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