Social media has been blocked in Uganda on the day of presidential elections to stop people "telling lies", President Yoweri Museveni has said.
Mr Museveni, 71, is seeking to extend his 30-year rule, in a race widely seen as the tightest in the East African state's history.
His main rival Kizza Besigye was briefly detained by police.
A foreign observer group condemned the blockage of social media and lengthy delays in opening voting booths.
Interviewed on TV about social media, Mr Museveni said: "Some people misuse those pathways. You know how they misuse them - telling lies.
"If you want a right then use it properly."
Many people found a way around the controversial restrictions, including opposition candidate Amama Mbabazi who tweeted advice on how to do it.
A VPN - a Virtual Private Network - gets round government censorship by redirecting your internet activity to a computer in a different country.
Facebook, Twitter, Whatsapp and mobile money services were blocked.
Despite this, #UgandaDecides was trending on Twitter.
Commonwealth election observer mission head Olusegun Obasanjo said: "It is ill advised if anyone has blocked social media."
Condemning the failure of voting stations to open on time, he said: "Delays of three, four, five and even six hours, especially in Kampala, are absolutely inexcusable and will not inspire trust and confidence in the system and the process".
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