Amitabh Bachchan has lashed out at social networking sites Twitter and Tumblr warning them to rectify the issues in his accounts on both websites.

Bollywood superstar Amitabh Bachchan is upset over the malfunctioning of social networking sites Twitter and Tumblr and has threatened to quit the two if the authorities didn't rectify the situation.

Apparently, a number of his fans and followers had been facing problems commenting on his blog and Twitter account. Naturally, the veteran actor was very upset after reading the comments on the malfunction, warning Twitter that if the problem does not sorted out he might go elsewhere.

He, in fact, even tweeted an apology to his followers on the micro-blogging site.

`Distraught to read comments on malfunction on Twitter and tumblr. blog.. sent warning to concerned - rectify or I go elsewhere !!` Big B tweeted.

The 'Angry Young Man' of Indian cinema also expressed remorse for those who faced problems in commenting on his blog.

`My apologies to those that face problems in commenting.. my blog too keeps disappearing.. cannot tolerate discomfort for Ef/TwFmXt .` he tweeted.

`Travelling again.. with deep concern for Ef/TwFmXt (extended family)... stay put for the moment... otherwise there are ''many other fish in the sea` he added.