Responding to the above headline you will probably look in the local paper, look at an agents shop window and see if they are on Rightmove before answering, and then reply based on your findings. But let me show you another angle to consider...
Once upon a time, a landlord when choosing a letting agent did so because this is where the tenant went to find property, they used to carry large adverts in the paper, collect tenant details and then when a property come on the books advertise it until a suitable tenant was found.
But landlords have so much alternative choice now. They could advertise it themselves through the various online portals and severely cut down their costs. So what can a letting agent do now that you cannot?