Muslims on social media are showing solidarity with Christians by observing the 40-day Lent fasting period.

The hashtag #Muslims4lent became a trending topic on the microblogging site Twitter on Friday, as thousands declared their willingness to give up a certain vice as is customarily done by Christians for the six-week period leading up to Easter.

The initiative was launched by a Muslim American, Bassel Riche, and it was first reported by The Huffington Post.

"Thus far, the reaction from Muslims and Christians alike has been wonderful and overwhelmingly positive," Riche told The Huffington Post. "Many of my Christian friends have responded showing their support and appreciation for these interfaith efforts. I hope this is just the beginning."