Monday has come and gone. People can delight in the fact that they have one less day to wait before the upcoming holiday weekend. But in the social media world, the focus isn't yet on days to come. Instead, Twitter, a key social media platform, was abuzz on Monday, October 7, with reactions to news from this past weekend. Amidst the usual self-promotional tweets, photo or feelings-sharing tweets, and tweets involving other miscellaneous topics, many celebrities took to Twitter to discuss the government shutdown, Obama's newly instated health care plan, and the movie Gravity, which hit theatres October 4.

Without further ado, here are the top celebrity tweets from Monday, October 7.

These celebrities discussed politics—specifically Obama Care and the government shutdown:

Ellen DeGeneres

Ricky Martin

Garcelle B

These stars praised the movie "Gravity" starring Sandra Bullock and George Clooney:

Lauren Graham

Buzz Aldrin

Olivia Wilde

In other news...

Tom Felton expressed nostalgia:

Adam Horowitz thanked fans:

Seth Meyers praised his peers:

Lena Dunham expressed her admiration for a certain author: