Welcome one, welcome all to this week's Twitter roundup, where we put all the best Twitterings and Instagrammings in one place for you to see, in one bite-sized package! This week, President Obama's inauguration, Seacrest crowns Justin Bieber the Grand Pooh-Bah of Twitter, some old men join the internet, Shakira gives birth, Seth Macfarlane brings civil rights to Tweets and more.

President Obama reflecting on his successes at the 2013 inauguration

"I want to take a look one more time. I'm not going to see this again."—The President pausing at the Capitol yesterday twitter.com/BarackObama/st…

— Barack Obama (@BarackObama) January 22, 2013

Is 50Cent having some romance issues?

Every time I try to be cool shit go BAD. people who say they Love you hurt you more then enemies.

— 50cent (@50cent) January 24, 2013

Kelly Osbourne fights against the system.

#DontBelieveEverythingYouRead

— Kelly Osbourne (@MissKellyO) January 24, 2013

Jimmy Fallon welcomes two classic comedians to Twitter.

Welcome @danacarvey and @robinwilliams to Twitter!! #sanfranlegends #lovethis

— jimmy fallon (@jimmyfallon) January 24, 2013

Seacrest congratulates Justin on his ascension to the Twitter throne.

@justinbieber btw congrats on hitting #1 on twitter!! with gr8 power comes great responsibility ;)

— Ryan Seacrest (@RyanSeacrest) January 23, 2013

Jim Carrey has been deeply affected by the Beyonce Lip-Synching scandal.

I couldn't sleep last night. How can any of us move forward without knowing for sure whether Beyonce lipsynced or not!;^P

— Jim Carrey (@JimCarrey) January 23, 2013

Denis Leary wants to help the firefighters and their families who sacrificed so much during Sandy.

Help FF's who were devastated by Sandy: active.com/donate/teamlff…

— Denis Leary (@denisleary) January 23, 2013

Miranda Kerr shows off baby pics of her and her beloved brother.

So blessed to have such a wonderful brother ❤ mattykerr26 instagr.am/p/UzksZykMDe/

— Miranda Kerr (@MirandaKerr) January 23, 2013

Shakira finally pops and gives birth to a baby boy.

Milan Piqué Mebarak shakira.com/post/412280894…

— Shakira (@shakira) January 22, 2013

Seth MacFarlane is advocating for emoticon affirmative action.

In honor of Dr. Martin Luther King's birthday, can we please get some black emoticons?I'm tired of using this

— Seth MacFarlane (@SethMacFarlane) January 21, 2013

That's all for this week! Check back next Saturday for another Twitter Weekly Roundup.