Twitter is overhauling some of its rules to try to make itself simpler to use and more attractive to newcomers.
Members will be able to add multimedia to tweets - including pictures and videos - without eating into the 140-characters-a-post limit.
The service is also changing the way it handles conversations between users.
Twitter co-founder and chief executive Jack Dorsey told the BBC his aim was to ensure that "when people tweet, it makes sense".
One analyst said the moves marked a "positive change", but added that they only addressed "one symptom" of Twitter's difficulty in increasing its audience.
Despite constant references to tweets in the news, over the past year Twitter has struggled to attract fresh users to its platform - a problem partly blamed on it being confusing.
"One of the biggest priorities for us this year is to really refine our product, to make it simpler," Mr Dorsey said.
"I think there's a story to be told about what Twitter's for, and to continue to strengthen why you would use Twitter."
