There is growing interest in the role of migrants' social networks as sources of social capital. Networks are, however, often conceptualized rather loosely and insufficient attention has been paid to how migrants access existing networks or establish new ties in the `host' society.The assumption that migrants are able to access dense networks within close-knit local communities simplifies the experiences of newly arrived migrants, underestimating difficulties they may face in accessing support. Exploring the work of Putnam, as well as Coleman and Bourdieu, we critically engage with the conceptualization of bonding and bridging social capital, and the relationship between them, through an exploration of Polish migrants' networking skills and strategies. In examining the different types and levels of support derived through social ties, this article contributes to understandings of social networking by arguing for a greater differentiation and specification of networks both vertically and horizontally, but also spatially and temporally.

Within migration studies literature there is a tendency to assume that migrants have ready access to kin and friendship networks which facilitate the migration and settling processes. Through tight bonds of trust and reciprocity, these networks are considered to be sources of social capital, providing a counter-balance to the disadvantages that migrants may encounter in the destination society. This paper argues that more attention is needed to the ways in which migrants access, maintain and construct different types of networks, in varied social locations, with diverse people.I suggest that the often simplistic dichotomy of bonding and bridging capital needs to be re-appraised and instead offer an alternative way of thinking about these social ties. The distinction between them tends to be understood on the basis of the ethnicity of the people involved -bonding involves close ties with 'people like us' while bridging involves links beyond 'group cleavages'. Insufficient attention has been paid to the actual resources flowing between these ties or the kinds of relationship developing between the actors involved. The nature of these social networks may be better understood by focusing on the relationship between the actors, their relative social location, and their available and realisable resources. Data from a qualitative study of Polish migrants in London is used to illustrate this approach.

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Developing on Granovetter's classic work on embeddedness in systems of social relations, this paper proposes the concept of 'differentiated embedding' to explore how migrants negotiate attachment and belonging as dynamic temporal, spatial and relational processes. When Poland joined the EU in May 2004, the large flow of migrants to the UK was perceived by many migration researchers as heralding a new form of transient mobility associated with short-term, temporary and circular migration, and high levels of transnationalism. Relatively little attention was paid to how these migrants were integrating in local contexts. Based on 20 in-depth interviews and network mapping with Polish migrants, resident in London for a decade, I examine why participants extended their stay and how their decisions were shaped by interpersonal relationships locally and transnationally. London as a 'superdiverse', global city offers place-specific opportunities for building networks and developing processes of embedding. Nonetheless, a focus on networks risks overlooking the wider structural context in which migrants live and work. Thus, I argue, there is a need for a differentiated concept to capture the nuanced interplay of structural, relational, spatial and temporal embedding. This concept not only captures multi-scalarity and multi-sectorality but also levels of belonging and attachment.