Users in France also used the hashtag #PorteOuverte, which means open door, to offer people in need a place to stay.
Twitter also posted its top tweets about news stories on the attacks using its new Moments feature.
On Monday, #SilenceForParis and #ISIS, the terrorist group claiming responsibility for the attacks, were still trending on Twitter. The word "Paris" was still trending on Twitter with a total of 3.31 million tweets.
NASA astronaut Scott Kelly, who is working onboard the International Space Station, tweeted over the weekend, "Shocked & saddened by terrorist attacks on #Paris. Standing with #France from @space_station. Our thoughts are w you."
NBC's The Today Show tweeted out, "Paris pausing for a moment of silence. #PrayForParis"
Facebook, which also provided a template with a blue, white and red overlay, the colors of the French flag, which users could add to their profile pictures, to show support for the French.
The social network also activated its Safety Check tool on Friday to enable users in a crisis area to mark themselves as safe so friends and family could check on them in one place. The Safety Check tool has since been turned off. Facebook was also criticized for not activating the tool after a terror attack in Lebanon on Thursday that killed 43 people.
Facebook and Twitter could not be reached for comment.
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