Instagram is back up after suffering an outage for over several hours, the photo-sharing social network platform said in a tweet, but Facebook’s app still seems to be down for some users across the globe.

Users around the world were facing trouble in accessing Instagram, Whatsapp and Facebook apps earlier on Wednesday, in one of the longest outages faced by the company in the recent past.

"Anddddd... we're back," Instagram tweeted here along with GIF image of Oprah Winfrey screaming in excitement.

Social media users in parts of United States, Japan and some parts Europe were affected by the outage, according to DownDetector's live outage map.

Facebook is still investigating the overall impact of the outage and is it may refuns advertisers for possible losses.

Facebook is projected to generate average daily revenue of about $189 million.

Facebook took to Twitter to say that the matter was not related to a distributed denial of service (DDoS) attack.