There were complaints of users receiving a "server error" just before 8 a.m. Eastern. Twitter's mobile app was partially functioning for some users but its timeline updated new tweets sporadically. Its search function appeared disabled as some hashtags or keyword searches returned no results. Users' profile pages appeared to be accessible from the mobile app. Third party services, such as the TweetDeck service, also returned a blank page. Twitter has suffered several service disruptions so far this year. On Monday, some users could not access Twitter on mobile and web for about 10 minutes. The service was disrupted on Friday for about 20 minutes. The outages come at a time when San Francisco-based Twitter and its executives are trying to convince Wall Street that they can deliver bigger revenue and profits. Meanwhile, the company's stock continues to languish at an all-time low. Twitter share have lost 66 percent of their value since peaking at $52.87 in April.