The second question is whether poor people are allowed entrance into the networks of the non-poor. A qualified guess leads to another negative answer. All societies are stratified, some more, some less. Stratification and differentiation have as their foremost goal to define some people or groups as members of their strata or organisation and to keep others out. The poor are by definition and tradition at the bottom of such stratified societies.
Social exclusion is still another feature of poverty.
Symbolic differentiation and exclusion may be just as powerful. The poor can be exposed as examples of failure to adjust to the dominating norms of the non-poor, understand the real values of society, get ahead, etc. The whole set of stereotypes can be put on the witness stand here. With all these stereotypes floating around there is little reason to believe that the poor will be welcome in most networks. In any network a member is expected to contribute with something, whether it be material or non-material resources.