  We prove that the Poisson boundary of a simple random walk on the Schreier
graph of action of $F$ on $\mathbb{D}$, where $\mathbb{D}$ is the set of dyadic
numbers in $[0, 1]$, is non-trivial. This gives a new proof of the result of
Kaimanovich: Thompson's group $F$ doesn't have Liouville property. In addition,
we compute growth function of the Schreier graph of the action of $F$ on
$\mathbb{D}$.
