Moving to the country with a foreign language does have an enormous impact on socialization in a new environment and indeed can create practical issues. In some cases, it can be the key factor in moving out of the country or can limit some people in their efforts to find new friends abroad.
I completely agree with a statement above, as for myself I have experienced some difficulties in adapting to a new social circle because of language barrier. In other words, I had trouble communicating with locals on daily basis simply because of the fear of failure. Sometimes it might be problematic and hard to express your true feelings in a new language. As a result, some people might prefer to avoid socialization with foreigners, which usually is the key factor in adapting to the new culture.
It is also worth mentioning that unwillingness to communicate in foreign language can negatively affect the level of speaking skills and therefore cause practical difficulties. The regular practice of language has a great impact on improving speaking to a certain level. As an example, some individuals who are not practicing a foreign language in their regular life might start forgetting it. An this can create even more social issues,
In conclusion, speaking a foreign language creates a number of disadvantages both social and practical for the people who moved to the new country. It might be useful to leave the comfort zone and try to speak with local nationals their native language as it can help to improve speaking skills.