I’m a great fan of Buffer, a simple and free tool that lets you schedule tweets in advance – but which automatically times them for slots when they are likely to get the most response.
That is really handy when you want a tweet to be seen or acted on, but it isn’t too time sensitive. You can manually schedule tweets with many other tools, but Buffer takes the extra step of letting you set up a series of prime time slots and then it automatically puts each message you schedule into the next one of those slots which is free. You can also use it with Facebook and LinkedIn.
I’ve found the service pretty reliable – occasional interruptions when lining up a tweet, but never failing to send one and never making a mess of sending one more than once. They have also been very responsive to questions I have sent their way.
If you do start using Buffer yourself, it would be great if you follow this link to sign up to Buffer, as that way both you and I will get a bonus extra free tweet added to the maximum size of our buffers. Thanks!
(As for how to work out when the prime time slots are for yourself, see my post about finding the best times to tweet.)