Facebook said the design, which includes more prominent photos and font changes, were the result of feedback from users over the past year.
Facebook has agreed to help a father view his dead son's Look Back video after his emotional YouTube appeal went viral.
As well as one and a quarter billion users, the social media network has seen revenues surge - but can it keep up such impressive growth?
Turkey's Prime Minister Tayyip Erdogan has said the nation could ban Facebook and YouTube, which he says have been abused by his political enemies, after local elections on March 30.
Erdogan is locked in a power struggle with the US-based Turkish cleric Fethullah Gulen, a former ally who he says is behind a stream of "fabricated" audio recordings posted on the internet allegedly revealing corruption in his inner circle.
"We are determined on this subject. We will not leave this nation at the mercy of YouTube and Facebook," Erdogan said.
He added that the possible barring of these sites was included in his planned measures.
Some WhatsApp users are apparently still experiencing problems with the instant messaging service, following a message posted from its official Twitter account to say that problems had been resolved after a two-hour outage.
Many were blaming the problems on the app being newly acquired by Facebook, which bought WhatsApp for $16 billion (£9.58 billion) on Wednesday.
@wa_status looks like whatsapp is still down. It did worked for 10 minutes....
WhatsApp sucks...still down. You made it like this Mark Suckerbug.
WhatsApp took to Twitter to complain about the problems with the instant messaging service, while others joked that the app's recent multi-billion dollar deal with Facebook was behind the two-hour outage.
WhatsApp undergoes some downtime, as founders are too busy counting out their Facebook billions one bill at a time
As local councils call for Facebook and Twitter to display Neknominate warnings on the social media site, a fan of the drinking game tells ITV News some people are taking it too far, but for him it's "a bit of harmless fun".
sorry we currently experiencing server issues. we hope to be back up and recovered shortly.
WhatsApp service has been restored. We are so sorry for the downtime...
Social media giant Facebook was left embarrassed after its new $16 billion (£9.58 billion) acquisition, WhatsApp, went down for more than two hours.
The team behind the instant messaging app, which was snapped up by Facebook on Wednesday, apologised to its more than more than 450 million monthly global users after suffering "server issues".
The highly popular mobile phone applications's chat conversations showed a loading asterisk and the alert "Connecting..." while the problems persisted.
The Local Government Association (LGA), which represents almost 400 councils in England and Wales, said social media operators such as Twitter and Facebook have a "responsibility" to display warnings over drinking craze Neknominate.
– Katie Hall, chair of the LGA's community wellbeing board
This is an utterly reckless and totally irresponsible craze which has tragically claimed lives. More should be done to highlight the dangers and persuade people not to participate.
We believe social media operators have a responsibility to provide health warnings to user groups and individuals.
The LGA is looking for these corporations to show leadership - and not ignore what is happening on their sites.
We are urging Facebook and Twitter executives to sit down with us and discuss a way forward which tackles this issue head-on.
Twitter and Facebook should introduce warnings over the drinking game Neknominate, which has been linked to several deaths, councils across England and Wales have said.
The Local Government Association said prominent messages were needed on the websites about the dangers of the craze, which involves people filming themselves downing alcohol, nominating someone to continue the game, and posting the video on social media sites.
Facebook's acquisition of the WhatsApp instant messaging service values the firm at around £11 billion - but why is it so much?